lower oil cooler line leak- remove the hose of entire block assembly

[billschroeder5842]

I've developed a small oil leak from the lower oil cooler hose where the fitting attaches to the block that fits on the cooler.

To get a perfect, no leak seal, is it better to remove the lower hose (leaving the upper hose and block attached) or to remove the block from the cooler and then remove the lower hose. Would a teflon around the threads make a difference?

Thanks!